2004-05-29 (updated 2018-09-18)
The third and, arguably, the best of Mega Man's NES adventures. Somewhat unique in that it features at least cameo appearences by every "boss" robot seen in the series to date - not only the eight new ones created for this game, but you get a rematch of sorts with the MM2 crowd (via the Doc Robot stages, where you battle a shadowy simulacrum several times as it adopts their powers), and the cast from the original MM game appears in the game's ending. At 18 stages total, it's also the longest of the NES series. This game also introduced Rush the Robo-Dog and Proto Man (the latter as "Break Man," who interrupts the stages every so often to briefly battle you). A must-own!

(From the Instruction Manual)
"Calling Mega Man! Calling Mega Man! Come in please!"

"Mega Man, we need you! We're down to the wire on our-peace-keeping project. We've got to get those last energy crystals or we can't finish it. Dr. Wily is here now, too ... Yes ... he's finally found his sanity. He knows where the crystals are! They're in the mining worlds, but we can't get to 'em. The robots are running amok and they're destroying everything!"

You've got to get there, Mega Man, and get those crystals! You'll face some pretty mean metal. Expect the worst! Is Rush there with you? Give him a bolt to chew on and tell him it's from us. What's that -- we must be getting static -- sounds like you said 'Woof!'"

"Mega Man, get to those mining worlds pronto! Grab the crystals and stop whoever's in charge!. He's one lunatic guy!"

"This is Dr. Light. Over and out!"